BOSTON--World of Warcraft developer Blizzard Entertainment today announced HearthStone: Heroes of Warcraft, a free-to-play collectible card game for PC, Mac, and iPad.

Gamers can sign up to beta-test the title today. The beta will launch this summer, with the full game due out sometime in 2013.

"We wanted to do something a little different," a Blizzard representative said while explaining the game during a presentation at gaming conference PAX East. The game, described as "really small," was built by a team of 15 developers at the Irvine, Calif., developer.